Light filter for headlights



Feb. 18, 1930. A. c. JACKSON LIGHT FILTER FOR HEADLIGHTS Filed 0Ct.- 27. 1927 FIG. 4'

I N VEN TOR,

FIG. 7

" on or pulled bfi of an incandescent lamp bulb Patented Felt 1 8,, 1930 UNITED STATES PATENT OFFICE;

ALBERT C. JACKSON, OF DAYTON, OHIO TIGHT FILTER FOR HEADLIGHTS Application filed October 27, 1927. Serial No. 229,053.

i This invention relatesto means for'filtering' the direct rays of light emitted by automobile and like lamps to make them non-glaring.

. It is one of the principal objects of my invention to provide means that can be cheaply.

manufactured and easily applied to a vehicle lamp for filtering out the glare of its ra-ys.

It is another object of my invention to provide, as one embodiment-thereof, a light-' filtering device which may be easily slipped without removing the latter from the refiector casing.

My invention makes unnecessary a low candle power'or a dimmed bulb itself, since it prevents all glare and produces a uniform light all over the reflector, thus increasing the amount of light emitted, without dark spots or hands. I

It is another object of my invention to provide a device which will projectthe rays of light without glare, far in advance of the automobile through the clear holes in the glass, since "only a small amount of light passes through them. With these holes or light-emitting spaces, the surrounding color filter co-operates to pervent all glare directly in front of the headlight, and since the frosted parts of the cap applied to the bulb filter the side rays emitted by the latter, there is no glare from anyangle.

.Other. important and incidental objects of my invention will be brought out in the following specification and particularly set forth in the subjoined claims. In the accompanying drawings illustrating my invention, Figure 1 is a side elevatonal View, partly in section, of my light filterng dome-shaped hood. Figure 2 is a.-front view of the same. Figure 3 is a rear View of the light-filter support. Figure 4 is-a longitudinalsectional view taken through the bulb and the light-filter applied thereto. Figure 5 is a side view of an incandescent lamp bulb having on its outer portion my apertured lightfiltering film. Figure 6 is a front view of .said bulb. Figure 7 is a longitudinal, sectonal view taken through a headlight, showing immediately behind the lens a transparent disc having my light-filtering film on its middle portion. And Figure 8 is a front View of said disc.

Referring *to the accompanying drawings for adetaileddescription of the forms of embodiment" of my invention illustrated therein, the numeral 1 in Figures 4 and 7 designates a conventional, incandescent lamp bulb.

This bulb is. secured in the usual manner within a headlight casing 2 behind a lens 3.

In order to eliminate the glare of the rays of light emitted by the headlight just described, or any otherof a similar nature, I provide for easy application to the bulb 1 the light-filter- 5 ing device now to be described. While this device may take different forms, the one i which I prefer for attachment to the bulb 1 is a dome-shaped body or hood 4 which is made of transparent material such'as glass. Upon the outer portion of the glass dome 4, I apply with a brush or by any other suit- "able means, a film 5 of green paint or other thin, colored, light-penetrating material.

Formed in theouter portionof the glass 4 and in this colored film '5 are direct light-ray emitting holes 6. However. these holes may be formed only in the colored film 5, asshown in Figure-4. In both instances they co-operate with the colored film in filtering the dipurpose, I provide the following means. 95,

The inner end of the glass dome 4 terminates in an outwardlyv projecting annular flange or head 7 Adapted tor be fitted over this bead is the bent-over portion 8 of an end rim member 9 whichis preferably a metal stamping mo applying the from which fingers or lugs 10 project inwardly, as shown in Figures 3and 4. By bearing against the inner end of the dome 4, these fingers not only assist in firmly securing the rim member 9 to the dome, but'act as gripping elements for engagement with the light bulb 1 to hold said dome firmly thereon. The light-filtering dome 4 is slipped over the bulb 1 to rest against the rear part of the reflector casing, the fingers 1O yielding sufliciently to enable them to slide over the widest part of the bulb and then grip it firmly at the rear, as shown in Figure 4. Therefore, no

springs, screws or other loose fastening ele ments need be employed for securmg the dome to the bulb, nor need the latter be re moved from the headlight for this purpose.

After the light-filtering dome or hood 4 is in place on thebulb 1 in the headlight 2, thelatter betweenits inner end and said film being, frosted.

In testimony whereof I have hereunto set my hand this 24th da of October, 1927.

-- ALB RT C. JACKSON.

In Figures 5 and 6, I have shown an incan- I descent lamp bulb 11 whose front end is'coated with my apertured light-filtering film 5, with its remaining part frosted, for the purpose of filtering the direct rays of light before they leave the bulb. In this modification, it

is not necessary to employ the light-filtering V dome or hood 4:;

Figures 7 and 8 illustrate another modifica-- tion of my invention in the provision of a disc 12 u on-whose middle portion my lightfiltering film 5 is placed. The remaining portion of the disc is frosted, the frosted portion co-operating with the filmed part 5 to filter the direct rays of light that pass through.

I This disc is secured in the reflector casing 2 of Figure 7 immediately behind the clear glass lens 3 to filter the direct rays of light emitted by the bulb 1-.

"It is thus seenthat in all forms of embodiment of my invention the drect rays of the head light are so filtered as to eliminate their glare. The various forms of my light-filtering device may be economically made and easily applied to any head light now in use, without changing the latter in any respect.

I do not wish to be limited to the details of construction and arrangement herein shown and described, and any changes or modifications may be made therein within the scope of the subjoined claim. 7 Having described my invention,I claim: A light-filtering means for headlightbulbs,"

comprising a dome-shaped body adapted to b'e slipped over said bulb, and a color film with light emitting holes, on the outer middle portion of said body, that portion of the 

